Hardwarecanucks posted a review of the Arctic Cooling Accelero S2 and Turbo Module

The Arctic Cooling Accelero S2 promises to deliver superior passive cooling performance and we have found that it does exactly that. The results speak for themselves with the S2 in passive mode cooling the 7600GT to levels lower than the stock fan can achieve. Add to that a price that is significantly below the majority of its competitors and this heatsink looks more and more appealing. Even the Turbo Module is priced perfectly and performs well enough that it justifies its additional cost. It is both quiet and it pushes the cooling performance of the S2 even further.

Arctic Cooling Accelero S2 & Turbo Module Review